allow packages to override/extend PKG_CONFIG_PATH

SVN-Revision: 25386

include/package.mk

@@ -43,6 +43,7 @@ override MAKEFLAGS=
 CONFIG_SITE:=$(INCLUDE_DIR)/site/$(REAL_GNU_TARGET_NAME)
 CUR_MAKEFILE:=$(filter-out Makefile,$(firstword $(MAKEFILE_LIST)))
 SUBMAKE:=$(NO_TRACE_MAKE) $(if $(CUR_MAKEFILE),-f $(CUR_MAKEFILE))
+PKG_CONFIG_PATH=$(STAGING_DIR)/usr/lib/pkgconfig
 
 ifeq ($(DUMP)$(filter prereq clean refresh update,$(MAKECMDGOALS)),)
   ifneq ($(if $(QUILT),,$(CONFIG_AUTOREBUILD)),)
@@ -80,8 +81,8 @@ define Build/Exports/Default
   $(1) : export STAGING_PREFIX=$$(STAGING_DIR)/usr
   $(1) : export PATH=$$(TARGET_PATH_PKG)
   $(1) : export CONFIG_SITE:=$$(CONFIG_SITE)
-  $(1) : export PKG_CONFIG_PATH=$$(STAGING_DIR)/usr/lib/pkgconfig
-  $(1) : export PKG_CONFIG_LIBDIR=$$(STAGING_DIR)/usr/lib/pkgconfig
+  $(1) : export PKG_CONFIG_PATH=$$(PKG_CONFIG_PATH)
+  $(1) : export PKG_CONFIG_LIBDIR=$$(PKG_CONFIG_PATH)
 endef
 Build/Exports=$(Build/Exports/Default)